Temporary work around for CB60 sound issues (#3325)

Temporary work around for CB60 sound issues (#3325)

* Temporary work around for CB60 sound issues

Discussed this with @fredizzimo, upping the system ticks to 100K fixes
the sound issues I was having with the CB60; speaker would fail to shut
off after playing music, sometimes at startup. This changes the matrix
scan time from it's default of every 2ms to once ever 200us.

Fred has a more extensive change to the way matrices are scanned which
will require less clock cycles and we can then revert this change at
that time.

* Remove keymap dir from clueboard root